Update Ruby/Gems and move static file serving to Rack

This PR is what is in production right now. Upgraded gems and Ruby to 2.0. Also moved static file serving to Rack pushing that load to the server itself. This should fix the gradual slow down that seemed to be resulting from static files somehow.

Also, changed DB configuration to only load connection after first use. This makes local development easier if you don't have PG or Redis installed.